Feature: Allow fragments to passed to hooks

[chrisvdm]

Problem: Users arent able to shape the replies coming back from api side via hooks

Solution: Pass Fragments directly to hooks

const { retrieveStripeCustomer } = useStripeCustomer({
    retrieveFragment: gql`
      fragment CustomerFragment on StripeCustomer {
        id
        name
        email
      }
    `,
  })

Already able to pass fragments on useStripeCustomer and useStripeSubscriptions

[chrisvdm]

Add docs for using <Cells/> for cases not catered for with plugin.